ЗМІСТ

Abdioglu C., Şahinkaya S., KÖR A.
Rigid, quasi-rigid and matrix rings with (σ,0)-multiplication

Bondarenko V.M., Tylyshchak A.A., Stoika M.V.
On the equivalence of matrices over commutative rings modulo ideals

Davis N., Elder M., Reeves L.
Non-contracting groups generated by (3,2)-automata

Gasiorek M., Simson D., Zajac K.
Algorithmic computation of principal posets using Maple and Python

Kulazhenko Yu.I.
Semiabelian and self-returning of points of n-ary groups

Paques A., Tamusiunas T.
A Galois-Grothendieck-type correspondence for groupoid actions

Protasov I., Slobodianiuk S.
On the subset combinatorics of G-spaces

Umar A.
Some combinatorial problems in the theory of partial transformation semigroups

Yegnanarayanan V.
Chromatic number of graphs with special distance sets, I